Scripts/VH: Add an 1 minute pause after each boss fight (instead of 5 seconds)

Revert one of the warning fixes (non standard C++)

src/server/game/Spells/SpellInfo.cpp

@@ -351,7 +351,7 @@ bool SpellEffectInfo::IsEffect() const
 
 bool SpellEffectInfo::IsEffect(SpellEffects effectName) const
 {
-    return Effect == effectName;
+    return Effect == uint32(effectName);
 }
 
 bool SpellEffectInfo::IsAura() const

src/server/scripts/Northrend/VioletHold/instance_violet_hold.cpp

@@ -690,7 +690,8 @@ public:
                 {
                     AddWave();
                     bActive = false;
-                    uiActivationTimer = 5000;
+                    // 1 minute waiting time after each boss fight
+                    uiActivationTimer = (uiWaveCount == 6 || uiWaveCount == 12) ? 60000 : 5000;
                 } else uiActivationTimer -= diff;
             }